mysql数据库添加图书信息_大项目之网上书城（八）——数据库大改&添加图书

大项目之网上书城(八)——数据库大改&添加图书

主要改动

今天也是各种各种各种出错的一天啊，经历了各种方法的重写，各种触发器的重写。

那么book表一分为n，多个子表更新数据的时候会联动book表更新数据。然后顺势写了个增加图书的方法。内容不多，错误不少、

1.数据库新增表

代码

以clothing为例，为各个类都新增了一个表。

drop table if exists `clothing`;

create table `clothing` (

`book_name` varchar(40) not null,

`price` double not null,

`describtion` varchar(200) default null,

`clazz` varchar(40) not null,

`second_id` int(11) not null auto_increment,

`book_img` blob,

`click_num` int(11) not null,

`buy_num` int(9) not null,

`re_du` int(12) default null,

`count` int(6) not null,

`is_new` int(1) not null,

`insert_date` date not null,

`book_id` int(11) default null,

primary key (`second_id`)

) engine=innodb auto_increment=5 default charset=utf8;

2.数据库新增触发器

还是以clothing表为例，两个方法，一个是当子表插入数据时，book表插入一条同样的数据，2是子表更新时，book也做出相应更新。

drop trigger if exists `c_insert`;

delimiter ;;

create trigger `c_insert` after insert on `clothing` for each row begin

insert into book(book_name,price,describtion,clazz,second_id,click_num,buy_num,count,is_new,insert_date) values(new.book_name,new.price,new.describtion,new.clazz,new.second_id,0,0,new.count,1,new.insert_date);

end

;;

delimiter ;

drop trigger if exists `c_update`;

delimiter ;;

create trigger `c_update` after update on `clothing` for each row begin

update book set book.re_du = new.click_num + new.buy_num * 100,book.click_num = new.click_num,book.buy_num = new.buy_num where clazz = new.clazz and second_id = new.second_id;

end

;;

delimiter ;

3.其他对bookservice和bookdao的修改

代码

因为改得代码太多，太乱了，不好发，于是重新都发一下实现类好了。

daoimpl

package cn.edu.bdu.mc.daos.impls;

import java.io.file;

import java.io.fileinputstream;

import java.io.ioexception;

import java.io.inputstream;

import java.sql.connection;

import java.sql.preparedstatement;

import java.sql.resultset;

import java.sql.sqlexception;

import java.util.date;

import java.util.list;

import javax.sql.datasource;

import org.apache.commons.dbutils.queryrunner;

import org.apache.commons.dbutils.handlers.beanhandler;

import org.apache.commons.dbutils.handlers.beanlisthandler;

import cn.edu.bdu.mc.beans.book;

import cn.edu.bdu.mc.daos.bookdao;

import cn.edu.bdu.mc.utils.jdbcutil;

public class bookdaoimpl implements bookdao {

private datasource datasource = jdbcutil.getdatasource();

private queryrunner queryrunner = new queryrunner(datasource);

@override

public book findnewbookbypaiming(int shu) throws sqlexception {

// todo auto-generated method stub

string sql = "select * from (select * from book where is_new = 1 order by re_du desc)as book1 limit "+(shu-1)+",1";

return queryrunner.query(sql, new beanhandler(book.class));

}

@override

public list findbookremen(int page) throws sqlexception {

string sql = "select * from (select * from book order by re_du desc)as book1 limit "+(page-1)*2+",2";

return queryrunner.query(sql, new beanlisthandler(book.class));

}

@override

public void insert(book book) throws sqlexception {

// todo auto-generated method stub

string sql = "insert into "+book.getclazz()+"(book_name,price,describtion,clazz,click_num,buy_num,count,is_new,insert_date) values(?,?,?,?,0,0,?,1,?)";

queryrunner.update(sql,book.getbook_name(),book.getprice(),book.getdescribtion(),book.getclazz(),book.getcount(),new date());

}

@override

public book findbookbyid(int book_id) throws sqlexception{

string sql = "select * from book where book_id = ?";

return queryrunner.query(sql, new beanhandler(book.class),book_id);

}

@override

public listfindallbook() throws sqlexception {

string sql = "select * from book";

return queryrunner.query(sql, new beanlisthandler(book.class));

}

@override

public void deletebyid(int book_id) throws sqlexception {

string sql = "delete from book where book_id = ?";

queryrunner.update(sql,book_id);

}

@override

public void update(book book) throws sqlexception {

string sql = "update book set book_name = ?, price = ?, describtion = ?, clazz = ?, second_id = ?, click_num = ?, buy_num = ?, count = ?, is_new = ? where book_id = ?";

queryrunner.update(sql,book.getbook_name(),book.getprice(),book.getdescribtion(),book.getclazz(),book.getsecond_id(),book.getclick_num(),book.getbuy_num(),book.getcount(),book.getis_new(),book.getbook_id());

}

@override

public void addimgbyname(string book_name, string path) throws sqlexception, ioexception {

// todo auto-generated method stub

connection conn = null;

preparedstatement ps = null;

fileinputstream in = null;

in = new fileinputstream(new file(path));

conn = jdbcutil.getconn();

string sql = "update book set book_img = ? where book_name = ?";

ps = conn.preparestatement(sql);

ps.setbinarystream(1, in, in.available());

ps.setstring(2, book_name);

int count = ps.executeupdate();

if (count > 0) {

system.out.println("插入成功！");

} else {

system.out.println("插入失败！");

}

jdbcutil.release(conn, ps);

}

@override

public inputstream getimgbyid(int book_id) throws sqlexception {

// todo auto-generated method stub

connection conn = null;

preparedstatement ps = null;

resultset rs = null;

inputstream in = null;

try {

conn = jdbcutil.getconn();

string sql = "select book_img from book where book_id = ?";

ps = conn.preparestatement(sql);

ps.setint(1, book_id);

rs = ps.executequery();

while (rs.next()) {

in = rs.getbinarystream("book_img");

}

} catch (exception e) {

e.printstacktrace();

}

jdbcutil.release(conn, ps, rs);

return in;

}

@override

public book findbookbyclazzander_id(string clazz, int er_id) throws sqlexception {

// todo auto-generated method stub

string sql = "select * from "+clazz+" where second_id = ?";

book book = queryrunner.query(sql, new beanhandler(book.class),er_id);

if(book.getbook_id()==0) {

sql = "select * from book where clazz = ? and second_id = ?";

book.setbook_id(queryrunner.query(sql,new beanhandler(book.class),clazz,er_id).getbook_id());

sql = "update "+clazz+" set book_id = ?";

queryrunner.update(sql,book.getbook_id());

}

return book;

}

@override

public void updateclazz(book book) throws sqlexception {

// todo auto-generated method stub

string sql = "update "+book.getclazz()+" set book_name = ?, price = ?, describtion = ?, clazz = ?, book_id = ?, click_num = ?, buy_num = ?, count = ?, is_new = ? where second_id = ?";

queryrunner.update(sql,book.getbook_name(),book.getprice(),book.getdescribtion(),book.getclazz(),book.getbook_id(),book.getclick_num(),book.getbuy_num(),book.getcount(),book.getis_new(),book.getsecond_id());

}

}

serviceimpl

package cn.edu.bdu.mc.services.impls;

import java.io.ioexception;

import java.io.inputstream;

import java.sql.sqlexception;

import java.util.arraylist;

import java.util.list;

import javax.sql.datasource;

import cn.edu.bdu.mc.beans.book;

import cn.edu.bdu.mc.daos.bookdao;

import cn.edu.bdu.mc.daos.impls.bookdaoimpl;

import cn.edu.bdu.mc.services.bookservice;

import cn.edu.bdu.mc.utils.jdbcutil;

public class bookserviceimpl implements bookservice {

private datasource datasource = jdbcutil.getdatasource();

private bookdao dao = new bookdaoimpl();

@override

public book findnewbookbypaiming(int shu) throws sqlexception {

// todo auto-generated method stub

return dao.findnewbookbypaiming(shu);

}

@override

public void click(int book_id) throws sqlexception {

// todo auto-generated method stub

book book = dao.findbookbyid(book_id);

book.setclick_num(book.getclick_num()+1);

dao.update(book);

dao.updateclazz(book);

}

@override

public void buy(int book_id) throws sqlexception {

// todo auto-generated method stub

book book = dao.findbookbyid(book_id);

book.setbuy_num(book.getbuy_num()+1);

dao.update(book);

}

@override

public list findbookremen(int page) throws sqlexception {

return dao.findbookremen(page);

}

@override

public void addimgbyname(string book_name, string path) throws sqlexception, ioexception {

// todo auto-generated method stub

dao.addimgbyname(book_name, path);

}

@override

public inputstream getimgbyid(int book_id) throws sqlexception {

// todo auto-generated method stub

return dao.getimgbyid(book_id);

}

@override

public book findbookbyclazzander_id(string clazz, int er_id) throws sqlexception {

// todo auto-generated method stub

return dao.findbookbyclazzander_id(clazz, er_id);

}

@override

public list findbookbyclazz(string clazz) throws sqlexception {

list list = dao.findallbook();

list newlist = new arraylist<>();

//lambda表达式，emmmm，的确可读性不太好的样子。

list.foreach(book->{if(book.getclazz().equals(clazz)){newlist.add(book);}});

/*

相当于

for (book book : newlist) {

if(book.getclazz().equals(clazz)){

newlist.add(book);

}

}

*/

return newlist;

}

@override

public void insert(string book_name, double price, string describtion, string clazz, int count)

throws sqlexception {

// todo auto-generated method stub

book book = new book(book_name,price,describtion,clazz,count);

dao.insert(book);

}

}

4.addbook.jsp

代码

pageencoding="utf-8"%>

添加图书

enctype="multipart/form-data" class="form-horizontal" role="form">

书名

placeholder="请输入书名" style="float:left"/>

价格

placeholder="请输入价格" style="float:left"/>

描述

placeholder="请输入描述" style="float:left">

类别

服装

食品

网络文学

育婴童

好书拍卖

家居

运动户外

数量

placeholder="请输入数量" style="float:left"/>

图片

class="form-control input-lg btn btn-primary"style="width:100%;float:left"/>

class="form-control input-lg btn btn-warning"style="width:100%;float:left"/>

效果图

5.addnewbookservlet

代码

package cn.edu.bdu.mc.servlets;

import java.io.file;

import java.io.fileoutputstream;

import java.io.ioexception;

import java.io.inputstream;

import java.io.outputstream;

import java.io.printwriter;

import java.sql.sqlexception;

import java.util.list;

import java.util.uuid;

import javax.servlet.servletexception;

import javax.servlet.annotation.webservlet;

import javax.servlet.http.httpservlet;

import javax.servlet.http.httpservletrequest;

import javax.servlet.http.httpservletresponse;

import org.apache.commons.fileupload.fileitem;

import org.apache.commons.fileupload.fileuploadexception;

import org.apache.commons.fileupload.disk.diskfileitemfactory;

import org.apache.commons.fileupload.servlet.servletfileupload;

import cn.edu.bdu.mc.services.bookservice;

import cn.edu.bdu.mc.services.impls.bookserviceimpl;

/**

* servlet implementation class addnewbookservlet

*/

@webservlet("/addnewbook")

public class addnewbookservlet extends httpservlet {

private static final long serialversionuid = 1l;

/**

* @see httpservlet#httpservlet()

*/

public addnewbookservlet() {

super();

// todo auto-generated constructor stub

}

/**

* @see httpservlet#doget(httpservletrequest request, httpservletresponse response)

*/

protected void doget(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception {

bookservice bookservice = new bookserviceimpl();

// string book_name = request.getparameter("book_name");

// string price = request.getparameter("price");

// string describtion = request.getparameter("describtion");

// string clazz = request.getparameter("clazz");

// string count = request.getparameter("count");

// //测试成功

// response.getwriter().write(book_name+"
"+price+"
"+describtion+"
"+clazz+"
"+count);

//把enctype="multipart/form-data"之后好像不能用普通方法获取了。。

diskfileitemfactory factory = new diskfileitemfactory();

file file = new file("d:\\target");

if(!file.exists()) {

file.mkdirs();

}

factory.setrepository(file);

servletfileupload fileupload = new servletfileupload(factory);

fileupload.setheaderencoding("utf-8");

try {

list fileitems = fileupload.parserequest(request);

string value = null;

string book_name = fileitems.get(0).getstring("utf-8");

double price = double.parsedouble(fileitems.get(1).getstring("utf-8"));

string describtion = fileitems.get(2).getstring("utf-8");

string clazz = fileitems.get(3).getstring("utf-8");

int count = integer.parseint(fileitems.get(4).getstring("utf-8"));

for (fileitem fileitem : fileitems) {

if(!fileitem.isformfield()) {

string filename = fileitem.getname();

filename = filename.substring(filename.lastindexof("\\")+1);

filename = uuid.randomuuid().tostring()+"_"+value+"_"+filename;

string webpath = "/upload/";

string filepath = getservletcontext().getrealpath(webpath+filename);

file file2 = new file(filepath);

file file3 = new file("d:\\upload\\"+filename);

file3.getparentfile().mkdirs();

file3.createnewfile();

file2.getparentfile().mkdirs();

file2.createnewfile();

inputstream inputstream = fileitem.getinputstream();

outputstream outputstream = new fileoutputstream(file2);

outputstream outputstream2 = new fileoutputstream(file3);

byte[] buffer = new byte[2048];

int len;

while((len = inputstream.read(buffer)) > 0) {

outputstream.write(buffer, 0, len);

outputstream2.write(buffer, 0, len);

}

inputstream.close();

outputstream.close();

outputstream2.close();

fileitem.delete();

try {

bookservice.insert(book_name, price, describtion, clazz, count);

string path = "d:/upload/"+filename;

bookservice.addimgbyname(book_name, path);

string htmlcode="\n" +

""

+ "

"

+ ""

+ ""

+ "

"

+ "

\r\n" +

"

添加成功！

继续添加    "

+"去主页\n" +

"

"

+ ""

+ "";

response.getwriter().write(htmlcode);

} catch (sqlexception e) {

// todo auto-generated catch block

e.printstacktrace();

}

}

}

} catch (fileuploadexception e) {

// todo auto-generated catch block

e.printstacktrace();

}

}

/**

* @see httpservlet#dopost(httpservletrequest request, httpservletresponse response)

*/

protected void dopost(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception {

// todo auto-generated method stub

doget(request, response);

}

}

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